聚羧酸高效减水剂与缓凝剂对无水硫铝酸钙-石膏体系流动性和凝结时间的影响

发布时间：2018-05-23 12:50

本文选题：聚羧酸高效减水剂 + 缓凝剂　；参考：《硅酸盐通报》2016年10期

【摘要】：本文研究了聚羧酸高效减水剂(PC)与柠檬酸(CA)、葡萄糖酸钠(SG)两种缓凝剂复合使用对无水硫铝酸钙(C4A3)-二水石膏(Ca SO4·2H_2O)复合体系性能的影响,测试了浆体流动度、凝结时间和吸附量的变化规律,并对其水化产物进行X-衍射分析(XRD)和微观形貌(SEM)分析。结果表明:随着CA掺量的增加体系初始流动度减小,流动度损失减小;随着SG掺量增加体系初始流动度增大,流动度损失减小。随着两种缓凝剂掺量的增加,C4A3-Ca SO4·2H_2O浆体凝结时间延长且初凝到终凝的时间间隔增大,SG的缓凝作用比柠檬酸强;两种缓凝剂均对体系水化产物AFt晶体有细化作用,并且SG对AFt的细化作用更加明显。
[Abstract]:In this paper, the effects of polycarboxylic acid superplasticizer (PCC) and sodium gluconate (Gluconate) retarder on the properties of anhydrous calcium sulphoaluminate (C4A3) -gypsum (Ca SO4 _ 2H _ 2O) composite system were studied, and the fluidity of the slurry was measured. The changes of setting time and adsorption amount were studied. The hydration products were analyzed by X-ray diffraction (XRD) and microscopic morphology (SEM). The results show that the initial fluidity decreases with the increase of CA content, and decreases with the increase of SG content. With the increase of the content of two retarders, the setting time of C4A3-Ca SO4 2H_2O slurry is prolonged and the time interval from initial setting to final setting increases. The retarding effect of SG is stronger than that of citric acid, and both retarders have fine effect on the hydration product AFt crystal of the system. The effect of SG on the refinement of AFt is more obvious.
【作者单位】：西安建筑科技大学材料与矿资学院;
【基金】：陕西省自然科学基础研究计划项目(2015JM5165) 西安建筑科技大学校科技基金(QN1421);西安建筑科技大学校人才科技基金(RC1341)
【分类号】：TU528

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